1．下次你应该早点儿来这儿。
Next time (you should have come here more earlier)．
2．你最好不要单独去游泳。
You'd (better not go swimming alone).
3．让我们开始讨论这个难题吧。
Let's (start to discuss this difficult problem).
4．这箱子太重，这小孩搬不动。
The box is (too heavy for this little boy to move).
5．每天我父亲去上班需要一个半小时。
Every day it (takes my fater one and a half hours to go to work).
6．瞧!树下有一位老人正在观看孩子们玩游戏。
Look! There is an old man under the tree (watching the children playing games).
7．我感到这个问题很难回答。
I found it (difficult to answer this question).
8 ．你的英语学习情况怎样?
How are (you getting along with your English)?
9．当我们到达火车站时，火车已开走了。
The train (has left when we had arrived at the railway station).
10．这位老人已当了30多年英语老师了。
The old man (has been an English teacher for more than 30 years).